# algebra

posted by .

What is the formula to find the area of a circle?

• algebra -

A = pi * r^2

## Similar Questions

1. ### Math

I need to find the area of a shaded part. it is a square with a circle the measurements that I have are pi = 3.14 and 15 ft by 15 ft. I know to find the area of the square I take base x height but cannot figure out correct formula …
2. ### maths

1 .Find formula the perimeter and area of a semicircle ?
3. ### Pre-Algebra

What is the formula to find the area of a circle?
4. ### Algebra

The area of a circle is given by the formula A = pi*r^2 and the circumference of the circle is given by C = 2*pi*r. Find the ratio of the area to the circumference. What happens to this ratio if the radius is quadrupled?
5. ### algebra equation

How do I find a formula for the area of a circle with a circumference c?

circle A has a raduis that is twice the length og the raduis of circle B. Which is an accurate statement about the relationship of these areas of circle A and B and y?
7. ### Algebra

The area of a circle is given by the formula A+pier^2, where r is the radius. If increasing the radius of a circle by 1 inch gives the resulting circle an area of 100pie square inches, what is the radius of the original circle?
8. ### maths

i just want to know the correct method to find out the volume and surface area of prism and cylinder. also the formula of perimeter of semi circle and complete circle also its area and how to find out the shaded part of area. with …
9. ### math

The area of a circle is given by the formula A = ðr2, where r is the radius. If increasing the radius of a circle by 1 inch gives the resulting circle an area of 100ð square inches, what is the radius of the original circle?
10. ### math

Find the area of a circle with center (-3, -4) that passes through the point (5, 2). First use the distance formula to find the radius of the circle. Use π = 3.14. ~ I did the distance formula and got 28 now i just dont know what …

More Similar Questions